|Rank|Athlete|Country|Time|Notes|
|---|---|---|---|---|
||Yevgeny Kulikov|Soviet Union|39.17|OR|
||Valery Muratov|Soviet Union|39.25||
||Dan Immerfall|United States|39.54||
|4|Mats Wallberg|Sweden|39.56||
|5|Peter Mueller|United States|39.57||
|6|Jan Bazen|Netherlands|39.78||
|6|Arnulf Sunde|Norway|39.78||
|8|Andrey Malikov|Soviet Union|39.85||
|9|Oloph Granath|Sweden|39.93||
|10|Jim Chapin|United States|40.09||
|11|Tom Overend|Canada|40.22||
|11|Masaki Suzuki|Japan|40.22||
|13|Johan Granath|Sweden|40.25||
|14|Gaétan Boucher|Canada|40.53||
|15|Pertti Niittylä|Finland|40.65||
|16|Norio Hirate|Japan|40.85||
|16|Archie Marshall|Great Britain|40.85||
|18|Mikio Oyama|Japan|40.90||
|19|Hans van Helden|Netherlands|40.91||
|19|Emmanuel Michon|France|40.91||
|21|Kay Arne Stenshjemmet|Norway|40.94||
|22|Lee Yeong-Ha|South Korea|41.08||
|23|Bruno Toniolli|Italy|41.44||
|24|Harald Oehme|East Germany|41.54||
|25|Colin Coates|Australia|41.77||
|26|Berend Schabus|Austria|42.33||
|27|Heinz Steinberger|Austria|43.28||
|28|Jan Egil Storholt|Norway|18.00||
|-|Horst Freese|West Germany|DNF||

Question: how many athletes ranked in the top 15 are from the united states?
Answer: 3